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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/services/app_service/public/cpp/instance_registry.h"
#include <memory>
#include <utility>
#include "base/containers/contains.h"
#include "base/memory/raw_ptr.h"
#include "base/unguessable_token.h"
#include "components/services/app_service/public/cpp/instance.h"
#include "components/services/app_service/public/cpp/instance_update.h"
namespace apps {
InstanceParams::InstanceParams(const std::string& app_id, aura::Window* window)
: app_id(app_id), window(window) {}
InstanceParams::~InstanceParams() = default;
InstanceRegistry::Observer::~Observer() {
CHECK(!IsInObserverList());
}
InstanceRegistry::InstanceRegistry() = default;
InstanceRegistry::~InstanceRegistry() {
for (auto& obs : observers_) {
obs.OnInstanceRegistryWillBeDestroyed(this);
}
DCHECK(observers_.empty());
}
void InstanceRegistry::AddObserver(Observer* observer) {
observers_.AddObserver(observer);
}
void InstanceRegistry::RemoveObserver(Observer* observer) {
observers_.RemoveObserver(observer);
}
void InstanceRegistry::CreateOrUpdateInstance(InstanceParams&& params) {
base::UnguessableToken instance_id;
auto it = window_to_instance_ids_.find(params.window);
if (it == window_to_instance_ids_.end()) {
instance_id = base::UnguessableToken::Create();
} else {
instance_id = *it->second.begin();
}
auto instance =
std::make_unique<Instance>(params.app_id, instance_id, params.window);
if (params.launch_id.has_value()) {
instance->SetLaunchId(params.launch_id.value());
}
if (params.state.has_value()) {
instance->UpdateState(params.state.value().first,
params.state.value().second);
}
if (params.browser_context.has_value()) {
instance->SetBrowserContext(params.browser_context.value());
}
OnInstance(std::move(instance));
}
void InstanceRegistry::OnInstance(InstancePtr delta) {
DCHECK_CALLED_ON_VALID_SEQUENCE(my_sequence_checker_);
if (!delta || !delta->InstanceId()) {
return;
}
// If the instance state is not kDestroyed, adds to
// `window_to_instance_ids_`, otherwise removes the instance key from
// `window_to_instance_ids_`.
if (static_cast<InstanceState>(delta->State() & InstanceState::kDestroyed) ==
InstanceState::kUnknown) {
auto it = instance_id_to_window_.find(delta->InstanceId());
// If `window` is changed, remove the instance id from
// `window_to_instance_ids_`.
if (it != instance_id_to_window_.end() && it->second != delta->Window()) {
MaybeRemoveInstanceId(/*instance_id=*/it->first, /*window=*/it->second);
}
window_to_instance_ids_[delta->Window()].insert(delta->InstanceId());
instance_id_to_window_[delta->InstanceId()] = delta->Window();
} else {
MaybeRemoveInstanceId(delta->InstanceId(), delta->Window());
instance_id_to_window_.erase(delta->InstanceId());
}
if (in_progress_) {
deltas_pending_.push_back(std::move(delta));
return;
}
DoOnInstance(std::move(delta));
while (!deltas_pending_.empty()) {
InstancePtr instance = std::move(*deltas_pending_.begin());
deltas_pending_.pop_front();
DoOnInstance(std::move(instance));
}
}
std::set<raw_ptr<const Instance, SetExperimental>>
InstanceRegistry::GetInstances(const std::string& app_id) {
auto it = app_id_to_instances_.find(app_id);
if (it == app_id_to_instances_.end()) {
return std::set<raw_ptr<const Instance, SetExperimental>>();
}
return it->second;
}
InstanceState InstanceRegistry::GetState(const aura::Window* window) const {
InstanceState state = InstanceState::kUnknown;
ForInstancesWithWindow(window, [&state](const apps::InstanceUpdate& update) {
state = update.State();
});
return state;
}
ash::ShelfID InstanceRegistry::GetShelfId(const aura::Window* window) const {
ash::ShelfID shelf_id;
ForInstancesWithWindow(
window, [&shelf_id](const apps::InstanceUpdate& update) {
shelf_id = ash::ShelfID(update.AppId(), update.LaunchId());
});
return shelf_id;
}
bool InstanceRegistry::Exists(const aura::Window* window) const {
bool found = false;
ForInstancesWithWindow(
window, [&](const apps::InstanceUpdate& update) { found = true; });
return found;
}
bool InstanceRegistry::ContainsAppId(const std::string& app_id) const {
return base::Contains(app_id_to_instances_, app_id);
}
void InstanceRegistry::DoOnInstance(InstancePtr delta) {
in_progress_ = true;
auto s_iter = states_.find(delta->InstanceId());
Instance* state = (s_iter != states_.end()) ? s_iter->second.get() : nullptr;
if (InstanceUpdate::Equals(state, delta.get())) {
in_progress_ = false;
return;
}
Instance* new_delta = delta.get();
if (state) {
old_state_ = state->Clone();
InstanceUpdate::Merge(state, new_delta);
} else {
old_state_.reset();
// `new_delta` is still valid, though `delta` is moved, because `new_delta`
// is the pointer to the content of `delta`.
states_.insert(std::make_pair(new_delta->InstanceId(), std::move(delta)));
app_id_to_instances_[new_delta->AppId()].insert(new_delta);
}
for (auto& obs : observers_) {
obs.OnInstanceUpdate(InstanceUpdate(old_state_.get(), new_delta));
}
if (static_cast<InstanceState>(new_delta->State() &
InstanceState::kDestroyed) !=
InstanceState::kUnknown) {
MaybeRemoveInstance(new_delta);
}
old_state_.reset();
in_progress_ = false;
}
void InstanceRegistry::MaybeRemoveInstance(const Instance* delta) {
DCHECK(delta);
auto it = states_.find(delta->InstanceId());
if (it == states_.end()) {
return;
}
const auto& app_id = delta->AppId();
app_id_to_instances_[app_id].erase(it->second.get());
if (app_id_to_instances_[app_id].empty()) {
app_id_to_instances_.erase(app_id);
}
states_.erase(it);
}
void InstanceRegistry::MaybeRemoveInstanceId(
const base::UnguessableToken& instance_id,
aura::Window* window) {
window_to_instance_ids_[window].erase(instance_id);
if (window_to_instance_ids_[window].empty()) {
window_to_instance_ids_.erase(window);
}
}
} // namespace apps
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